The present invention is directed to methods for reducing SOx, NOx, and CO
emissions from a fluid stream comprising contacting said fluid stream
with a compound comprising magnesium and aluminum and having an X-ray
diffraction pattern displaying at least a reflection at a two theta peak
position at about 43 degrees and about 62 degrees, wherein the ratio of
magnesium to aluminum in the compound is from about 1:1 to about 10:1. In
one embodiment, the ratio of magnesium to aluminum in the compound is
from about 1:1 to about 6:1. In one embodiment, the ratio of magnesium to
aluminum in the compound is from about 1.5:1 to about 10:1. In another
embodiment, the invention is directed to methods wherein the ratio of
magnesium to aluminum in the compound is from about 1.5:1 to about 6:1.